pygame mouse refresh problem

I am making this little, supposed to be simple and easy, training app to play little video files and have a menu bar along the left to start and stop the different clips. I am using pygame. The app works fine on my computer, but when I run it on the computer I am making it for the mouse leaves trails when it moves over the menu(while the movies are playing). It is drawing the pointer but forgetting to "undraw" it when it moves. I guess I could manually redraw the buttons whenever the mouse moves over them but that seems like a huge pain, plus I thought the mouse was supposed to take care of itself. Any suggestions would be helpful. Thanks.

If it helps, the problem only occurs in fullscreen mode. Windowed mode works fine on both computers.